<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>引用animate动画函数</title>
  <style>
    .sliderbar {
      position: fixed;
      right: 0;
      bottom: 100px;
      width: 40px;
      height: 40px;
      text-align: center;
      line-height: 40px;
      cursor: pointer;
      color: #fff;
    }

    .con {
      position: absolute;
      left: 0;
      top: 0;
      width: 200px;
      height: 40px;
      background-color: purple;
      z-index: -1;
    }
  </style>
  <script src="23.1-animate.js"></script>
</head>
<body>
  <div class="sliderbar">
    <span>←</span>
    <div class="con">问题反馈</div>
  </div>

  <script>
    // 1. 获取元素
    var sliderbar = document.querySelector('.sliderbar')
    var con = document.querySelector('.con')
    // 当我们鼠标经过 sliderbar 就会让 con这个盒子滑动到左侧
    // 当我们鼠标离开 sliderbar 就会让 con这个盒子滑动到右侧
    sliderbar.addEventListener('mouseenter', function () {
      // animate(obj, target, callback)
      animate(con, -160, function () {
        // 当我们动画执行完毕，就把 ← 改为 →
        sliderbar.children[0].innerHTML = '→'
      })

    })
    sliderbar.addEventListener('mouseleave', function () {
      // animate(obj, target, callback)
      animate(con, 0, function () {
        sliderbar.children[0].innerHTML = '←'
      })
    })
  </script>
</body>
</html>